import os

from flask import Flask , json
from werkzeug.exceptions import HTTPException

# flask init-db 部署其他机器需要先设置flask项目，奇怪的是vscode无法正常识别
# 在cmd可以正常执行
def create_app(test_config=None):
    # create and configure the app
    app = Flask(__name__, instance_relative_config=True)
    app.config.from_mapping(
        SECRET_KEY='dev',
        DATABASE=os.path.join(app.instance_path, 'flaskr.sqlite'),
    )

    if test_config is None:
        # load the instance config, if it exists, when not testing
        app.config.from_pyfile('config.py', silent=True)
    else:
        # load the test config if passed in
        app.config.from_mapping(test_config)

    # ensure the instance folder exists
    try:
        os.makedirs(app.instance_path)
    except OSError:
        pass

    # a simple page that says hello
    @app.route('/hello')
    def hello():
        return 'Hello, World!'

    @app.errorhandler(HTTPException)
    def handle_exception(e):
        """Return JSON instead of HTML for HTTP errors."""
        # start with the correct headers and status code from the error
        response = e.get_response()
        # replace the body with JSON
        response.data = json.dumps({
        "code": e.code,
        "name": e.name,
        "description": e.description,
        })
        response.content_type = "application/json"
        return response 


    from . import db
    db.init_app(app)
    
    from . import auth
    app.register_blueprint(auth.bp)


    #from . import blog
    #app.register_blueprint(blog.bp)
    #app.add_url_rule('/', endpoint='index')

	
	

    return app
